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參數(shù)資料
| 型號： | TPS61058DRC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE HIGH POWER WHITE LED DRIVER |
| 中文描述： | 同步升壓轉(zhuǎn)換器斷電模式高功率白光LED驅(qū)動 |
| 文件頁數(shù)： | 14/30頁 |
| 文件大?。?/td> | 1684K |
| 代理商： | TPS61058DRC |
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ILED
0.5
R2
IBIAS
RS
R5
(R4
(2)
IBIAS
R3
R5)nFLASH
R3, assuming R4
R5 is small compared R3.
(3)
ILED
0.5
R2
IBIAS2
RS
R5
(R4
1
2
RS
R2
R3
2
RS
R5
R5
R2
R3
RS
Vx
(4)
IBIAS2
R3
R5 )nFLASH
R3, with R5
R6
R6
(5)
ILED(FLASH)
R2
R3
2
R3
RS
, assumingR4
R5
R6 is small compared R3.
(6)
Vx
1
2
R3
2
R2
ILED(MOVIE
LIGHT,PRE
R5
R5
CHARGE)
R3
RS
R2
(7)
Vx
R5
R4
R5nFLASH, with R5
R6
R6
(8)
TPS61058
TPS61059
SLVS572B–APRIL 2005–REVISED DECEMBER 2005
The circuit operation can be split into different phases:
1. Pre-Charge Phase (IOK = Hi-Z)
During this phase IOK is kept high-impedance. For proper startup the external loop components need to be
chosen so that the regulation loop can settle for a maximum LED current of less than 84 mA. This can be
achieved by increasing the bias voltage (V
X
) of the feedback network.
2. High-Current Operation (IOK = GND)
After the pre-charge phase, IOK is automatically pulled to ground. This modifies the feedback divider network
changing the potential of the V
X
node. As a consequence the LED current is adjusted accordingly.
For operation at maximum LED current (flashlight mode), nFLASH needs to be set to ground level.
For operation at other LED currents (movie-light or pre-charge), nFLASH applies a positive bias voltage (1.8 V
for example) to the feedback divider network. The following equations show the relationship between LED
current and bias voltage Vx.
For stable operation, it is recommended that R3 be set in the range of 50 k
to 150 k
and R5 in the range of
3.3 k
to 10 k
. Best performance is obtained with a pre-charge current of 45 mA typ.
For single current level applications (e.g. torch or flashlight only) it is recommended to operate with R4 in the
range of 50k
to 200 k
. In that case R5 is not need anymore.
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS61058DRCR | 功能描述:LED照明驅(qū)動器 Hi-Power Single Cell White LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61058DRCR | 制造商:Texas Instruments 功能描述:IC LED DRIVER PHOTO FLASH 10-SON |
| TPS61058DRCRG4 | 功能描述:LED照明驅(qū)動器 Hi-Power Single Cell White LED Driver RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS61059 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE HIGH POWER WHITE LED DRIVER |
| TPS61059DRC | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SYNCHRONOUS BOOST CONVERTER WITH DOWN MODE HIGH POWER WHITE LED DRIVER |
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